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Date: Wed, 4 Sep 1996 02:31:37 -0600 (MDT)
From: Doug Russell <drussell@saturn-tech.com>
To: Andreas Kohout <shanee@augusta.de>
cc: current@FreeBSD.ORG
Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it)
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On Tue, 2 Sep 1997, Andreas Kohout wrote:

> OR> According to Søren Schmidt:
> OR> > dd if=/dev/rwd0  of=/dev/null count=1600 bs=64k
> OR> > 1600+0 records in
> OR> > 1600+0 records out
> OR> > 104857600 bytes transferred in 11.357939 secs (9232097 bytes/sec)
> OR> 
> OR> Nice.
> OR> 
> OR> Here are some data points as well. sd1 is an IBM DCAS 34330W (used here in
> OR> narrow mode only), sd0 is a IBM DORS 32160; both are on the same ASUS
> OR> SC-200.
> 
> FYI: a IBM DCAS 34330W normal mounted on SC 200
> 
> root:/usr/local/src# dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k
> 1600+0 records in
> 1600+0 records out
> 104857600 bytes transferred in 12.862972 secs (8151895 bytes/sec)

hcs:/home/drussell {1} dd if=/dev/rwd0  of=/dev/null count=1600 bs=64k
1600+0 records in
1600+0 records out
104857600 bytes transferred in 11.416036 secs (9185115 bytes/sec)

Disk is a Western Digital 3.1 Gig on an ASUS TX-97E with a K6-166 running
at 75x2.5 = 187.5 MHz.  With the bus at 83 Mhz (x2 = 166 Mhz) it runs
about 10.5-11 megs/sec, but my kernel make time drops by about 8 seconds.
I don't want to run it at 83x2.5, as it is getting a little fast for a 166
Mhz chip.  Besides, at 187.5 MHz, make world on a couple of days ago
-stable takes 2:28.  And it did several consecutive make worlds, so I
figure it's working fine.  (For now, anyway.)

I was impressed with the disk speed, though.  Not bad for EIDE, and no DMA
installed.  I haven't had a chance to play with the new DMA driver yet. 

Later......						<Doug>